Here is the full list of all 57 Hero of the Kingdom III achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Find some treasure.
Achieve 140 fame.
Get the lockpicking skill to 100.
Defeat Earthquaker.
Pick 60 locks.
Get the smithing skill to 100.
Get the combat skill to 100.
Make 80 weapons or shields.
Mine 50 pieces of silver ore.
Visit the Azure Valley.
Make 600 various potions.
Destroy all of the orc camps.
Cook 8,000 food.
Get the mining skill to 100.
Get the fishing skill to 100.
Find 24 pearls.
Find 400 eggs.
Find 120 lost crates and barrels.
Find 800 mushrooms.
Have 5,000 gold coins.
Get the cooking skill to 100.
Hunt down 150 wild animals.
Kill 300 monsters.
Pick 300 flowers.
Mine 50 pieces of iron ore.
Get the archery skill to 100.
Get the alchemy skill to 100.
Make 10 swords.
Pick 15 locks.
Make 100 healing potions.
Catch a golden fish.
Hunt down 20 foxes.
Get the herbalism skill to 100.
Achieve 70 fame.
Catch 100 fish.
Learn the mining skill.
Learn the smithing skill.
Visit the Gray Valley.
Have 1,000 gold coins.
Have at least 1,000 strength.
Cook 2,000 food.
Learn the lockpicking skill.
Kill 150 monsters.
Gather 100 berries.
Learn the alchemy skill.
Learn the herbalism skill.
Save the mayor of the Yellow Valley.
Find 30 lost crates and barrels.
Find 6 pearls.
Find 200 mushrooms.
Find 100 eggs.
Visit the Yellow Valley.
Have at least 100 strength.
Learn the fishing skill.
Kill 50 monsters.
Hunt down 20 rabbits.
Learn the cooking skill.